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LEASES - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 800 $ 699
Lease liability $ 835 $ 721
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities